Solar Cycle–induced Variations in GONGp‐Mode Frequencies and Splittings

We have analysed the recently available GONG p-mode frequencies and splittingcoefficients for a period of three and half years, including the rapidly risingphase of solar cycle 23. The analysis of mean frequency shift with differentactivity indices shows that the shift is equally correlated with both magneticand radiative indices. During the onset of the new cycle 23, we notice that thechange in $b_4$ splitting coefficient is more prominent than the change in$b_2$. We have estimated the solar rotation rate with varying depth andlatitude. In the equatorial region, the rotation first increases with depth andthen decreases, while an opposite behaviour is seen in the polar region. Wealso find a small but significant temporal variation in the rotation rate athigh latitudes.Comment: Uses aastex, To appear in Astrophysical Journal, October 10, 2000 issu